Laboratory 12 : Tract Systems I
  Somatosensory System : Spinoreticulotectothalamic Tract

Spinoreticulotectothalamic Tract

It is important to note that:

  • This tract plays a significant role in arousal and attention.
  • This path is bilateral (info coming in from one side of body will go up both sides of spinal cord).
  • Decussation occurs at level of entry in spinal cord.
  • This is a non-specific pathway, so its NOT somatotopic or submodality specific.
  • There are lots of synapses via reticular formation throughout ascension.

 

Slide 90 : Telencephalon

  • Synapses in all parts of the cerebral cortex(neocortex, paleocortex, archicortex).

Slide 67 : Diencephalon

  • Synapses on medial and intralaminar nuclei in the thalamus.

Slide 45 : Pons/Midbrain

  • Synapse in reticular formation.

Slide 26 : Medulla

  • Synapse in reticular formation.

Slide 18 : Caudal Medulla

  • Synapse in reticular formation.

Slide 8 : C6

  • Afferent fibers enter the dorsal horn.
  • Synapse on tract cells in dorsal horn.
  • Tract cell axons decussate, some stay ipsilateral (i.e. this path is bilateral).
  • Axons ascend ventrolateral funiculus in spinal cord.

Slide 2 : L6

  • Afferent fibers enter the dorsal horn.
  • Synapse on tract cells in dorsal horn.
  • Tract cell axons decussate, some stay ipsilateral (i.e. this path is bilateral).
  • Axons ascend ventrolateral funiculus in spinal cord.

Copyright © 2006 - University of Pennsylvania School of Veterinary Medicine, All rights reserved.
Faculty: Dr. Richard Miselis, Dr. Peter Hand
Students: Natalie Fickel V'12, Ryan Donahue V'09, Cara Catanese V’08, Rebecca Wolf V'06, Keith Javic V'03, Ken Bixel V'99, Russel Howe-Smith V'97